AutoMapper在MVC中的运用03-字典集合、枚举映射,自定义解析器

本篇AutoMapper使用场景：

※ 源字典集合转换成目标字典集合

※ 枚举映射

※ 自定义解析器

※ 源中的复杂属性和Get...方法转换成目标属性

源字典集合转换成目标字典集合

□ Domain model

public class SourceValue

{

public int Value { get; set; }

}

□ View model

public class DestValue

{

public int Value { get; set; }

}

□ 映射配置

Mapper.CreateMap<SourceValue, DestValue>();

□ 使用

public ActionResult Dic()

{

var sourceDict = new Dictionary<string, SourceValue>

{

{"First", new SourceValue(){Value = 5}},

{"Second",new SourceValue(){Value = 10}}

};

var destDict = Mapper.Map<Dictionary<string, SourceValue>, IDictionary<String, DestValue>>(sourceDict);

return View((destDict));

}

枚举映射

public enum OrderStatus : short

{

InProgress = 0,

Complete = 1

}

public enum OrderStatusDto

{

InProgress = 0,

Complete = 1

}

□ 使用

//例子1

public ActionResult Meiju()

{

var dest = Mapper.Map<OrderStatus, OrderStatusDto>(OrderStatus.InProgress);

return View(dest);

}

//例子2

public ActionResult Meiju1()

{

var dest =

Mapper.Map<AttributeTargets, AttributeTargets>(AttributeTargets.Class | AttributeTargets.Interface);

return View(dest);

}

□ 要点

枚举映射不需要做映射配置。

自定义解析器

□ Domain model

public class Source1

{

public int Value { get; set; }

public int Value2 { get; set; }

}

□ View model

public class Destination1

{

public int Total { get; set; }

}

□ 自定义解析器，继承于ValueResolver<,>

public class CustomResolver : ValueResolver<Source1,int>

{

protected override int ResolveCore(Source1 source)

{

return source.Value + source.Value2;

}

}

□ 映射配置

Mapper.CreateMap<Source1, Destination1>()

.ForMember("Total", opt => opt.ResolveUsing<CustomResolver>());

□ 使用

public ActionResult Jiexi()

{

var source = new Source1()

{

Value = 5,

Value2 =  7

};

var dest = Mapper.Map<Source1, Destination1>(source);

return View(dest);

}

□ 要点

派生ValueResolver<,>实现自定义解析器，实现对源属性的"计算" 转换成目标属性。

源中的复杂属性和Get...方法转换成目标属性

□ Domain model

public class Order2

{

private readonly IList<OrderLineItem2> _orderLineItems = new List<OrderLineItem2>();

public Customer2 Customer { get; set; }

public OrderLineItem2[] GetOrderlineItems()

{

return _orderLineItems.ToArray();

}

public void AddOrderLineItem(Product2 product, int quantity)

{

_orderLineItems.Add(new OrderLineItem2(product, quantity));

}

public decimal GetTotal()

{

return _orderLineItems.Sum(li => li.GetTotal());

}

}

public class OrderLineItem2

{

public OrderLineItem2(Product2 product, int quantity)

{

Product = product;

Quantity = quantity;

}

public Product2 Product { get; set; }

public int Quantity { get; set; }

public decimal GetTotal()

{

return Quantity*Product.Price;

}

}

public class Customer2

{

public string Name { get; set; }

}

public class Product2

{

public string Name { get; set; }

public decimal Price { get; set; }

}

□ View model

public class Order2Dto

{

public string CustomerName { get; set; }

public decimal Total { get; set; }

}

□ 映射配置

Mapper.CreateMap<Order2, Order2Dto>();

□ 使用

public ActionResult Complex()

{

var customer = new Customer2()

{

Name = "Darren"

};

var order = new Order2()

{

Customer = customer

};

var product = new Product2()

{

Name = "bosco",

Price = 5.00m

};

order.AddOrderLineItem(product, 10);

Order2Dto dto = Mapper.Map<Order2, Order2Dto>(order);

return View(dto);

}

□ 要点

目标中的属性遵循惯例：

○ 源中复杂属性名+复杂属性对应类的属性，构成了目标属性

○ 源中Get...()方法转换成目标中的...属性